| 초록 |
With the advent of wearables and flexible electronics, graphene has been recently spotlighted as a transparent conductive electrode (TCE) for optoelectronic device including light emitting diode and organic photovoltaic cells. In this work, we demonstrate a chemical doping method of non-oxidized graphene flake (NOGFs) to modulate the work function and charge carrier density by using the metal chlorides (NaCl, KCl, and AuCl3) and organic compounds (HNO3). The NOGFs having a lateral side size exceeding 5 μm was synthesized with graphite intercalation compound method (GIC). Especially, doped graphene flake film (DGFF) containing AuCl3 dopant achieved an electrical conductivity of 2.008 x 105 S / m at 75% transmittance, one of the lowest values ever reported from the graphene flakes. and control the work function from 4.32 eV to 5.1 eV, an organic photovoltaic device (OPV) having Au-DGFFs as a hole transport layer (HTL) exhibits improved power conversion efficiency (PCE). Therefore, this approach shed light on numerous applications of DGFFs to transparent conducting electrodes. |
